Ulcer
/ˈʌlsər/
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Definition
(noun) An open sore of the skin, eyes or mucous membrane, often caused by an initial abrasion and generally maintained by an inflammation and/or an infection.
Sentence Examples
An ulcer forms in the stomach.
I have an ulcer in my mouth.
CEFR Practice Quiz
He had to follow a very strict diet to help heal the painful stomach ____ that had been bothering him for weeks today.